gcc/flags.h

   1 /* Compilation switch flag definitions for GCC.
   2    Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
   3    2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_FLAGS_H
  23 #define GCC_FLAGS_H
  24
  25 #include "flag-types.h"
  26 #include "options.h"
  27
  28 #if !defined(IN_LIBGCC2) && !defined(IN_TARGET_LIBS) && !defined(IN_RTS)
  29
  30 /* Names of debug_info_type, for error messages.  */
  31 extern const char *const debug_type_names[];
  32
  33 extern void strip_off_ending (char *, int);
  34 extern int base_of_path (const char *path, const char **base_out);
  35
  36 /* Return true iff flags are set as if -ffast-math.  */
  37 extern bool fast_math_flags_set_p (const struct gcc_options *);
  38 extern bool fast_math_flags_struct_set_p (struct cl_optimization *);
  39
  40 /* Used to set the level of -Wstrict-aliasing in OPTS, when no level
  41    is specified.  The external way to set the default level is to use
  42    -Wstrict-aliasing=level.
  43    ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
  44    and 0 otherwise.  After calling this function, wstrict_aliasing will be
  45    set to the default value of -Wstrict_aliasing=level.  */
  46
  47 extern void set_Wstrict_aliasing (struct gcc_options *opts, int onoff);
  48 \f
  49 /* Now the symbols that are set with `-f' switches.  */
  50
  51 /* True if printing into -fdump-final-insns= dump.  */
  52
  53 extern bool final_insns_dump_p;
  54
  55 \f
  56 /* Other basic status info about current function.  */
  57
  58 /* Target-dependent global state.  */
  59 struct target_flag_state {
  60   /* Values of the -falign-* flags: how much to align labels in code.
  61      0 means `use default', 1 means `don't align'.
  62      For each variable, there is an _log variant which is the power
  63      of two not less than the variable, for .align output.  */
  64   int x_align_loops_log;
  65   int x_align_loops_max_skip;
  66   int x_align_jumps_log;
  67   int x_align_jumps_max_skip;
  68   int x_align_labels_log;
  69   int x_align_labels_max_skip;
  70   int x_align_functions_log;
  71
  72   /* The excess precision currently in effect.  */
  73   enum excess_precision x_flag_excess_precision;
  74 };
  75
  76 extern struct target_flag_state default_target_flag_state;
  77 #if SWITCHABLE_TARGET
  78 extern struct target_flag_state *this_target_flag_state;
  79 #else
  80 #define this_target_flag_state (&default_target_flag_state)
  81 #endif
  82
  83 #define align_loops_log \
  84   (this_target_flag_state->x_align_loops_log)
  85 #define align_loops_max_skip \
  86   (this_target_flag_state->x_align_loops_max_skip)
  87 #define align_jumps_log \
  88   (this_target_flag_state->x_align_jumps_log)
  89 #define align_jumps_max_skip \
  90   (this_target_flag_state->x_align_jumps_max_skip)
  91 #define align_labels_log \
  92   (this_target_flag_state->x_align_labels_log)
  93 #define align_labels_max_skip \
  94   (this_target_flag_state->x_align_labels_max_skip)
  95 #define align_functions_log \
  96   (this_target_flag_state->x_align_functions_log)
  97 #define flag_excess_precision \
  98   (this_target_flag_state->x_flag_excess_precision)
  99
 100 /* Nonzero if we dump in VCG format, not plain text.  */
 101 extern int dump_for_graph;
 102
 103 /* Returns TRUE if generated code should match ABI version N or
 104    greater is in use.  */
 105
 106 #define abi_version_at_least(N) \
 107   (flag_abi_version == 0 || flag_abi_version >= (N))
 108
 109 /* True if overflow wraps around for the given integral type.  That
 110    is, TYPE_MAX + 1 == TYPE_MIN.  */
 111 #define TYPE_OVERFLOW_WRAPS(TYPE) \
 112   (TYPE_UNSIGNED (TYPE) || flag_wrapv)
 113
 114 /* True if overflow is undefined for the given integral type.  We may
 115    optimize on the assumption that values in the type never overflow.
 116
 117    IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
 118    must issue a warning based on warn_strict_overflow.  In some cases
 119    it will be appropriate to issue the warning immediately, and in
 120    other cases it will be appropriate to simply set a flag and let the
 121    caller decide whether a warning is appropriate or not.  */
 122 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
 123   (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
 124
 125 /* True if overflow for the given integral type should issue a
 126    trap.  */
 127 #define TYPE_OVERFLOW_TRAPS(TYPE) \
 128   (!TYPE_UNSIGNED (TYPE) && flag_trapv)
 129
 130 /* True if pointer types have undefined overflow.  */
 131 #define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
 132
 133 /* Whether to emit an overflow warning whose code is C.  */
 134 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
 135
 136 #endif
 137
 138 #endif /* ! GCC_FLAGS_H */